Farrington township
- County:
- Jefferson County
- County Seat:
- No
- Area (mi²):
- 36.669
- State:
- Illinois
Farrington township is located in Jefferson County, Illinois. Farrington township has a 2026 population of 566. Farrington township is currently declining at a rate of -0.18% annually and its population has decreased by -1.91% since the most recent census, which recorded a population of 577 in 2020.
The median household income in Farrington township is $81,250 with a poverty rate of 5.25%. The median age in Farrington township is 31.8 years: 30.1 years for males, and 33.5 years for females. For every 100 females there are 125.0 males.